Don't listen to him good sir. Your PC meets the "bare" min requirements to play the game. But you'll be playing at very low settings. Make sure that your PC has less than 50 processes running to make sure this game get's all the juice from your CPU.

To check. Right click the task bar and click "View Task Manager"

And you should see it on the bottom left of it.

Anyways here.

"Developers Rockstar have revealed that, at a minimum, gamers should have an Intel Dual Core 3GHz or AMD equivalent, 3GB of RAM and a Nvidia GeForce 450 512MB RAM or AMD Radeon HD 4870 512MB RAM."

---------------------------------------------------------------------------In the Darkness I wrought destruction, forever in the void of black shall I die.